Desperate. Please help

My baby is 9 months old. Was exclusively breast fed until 6 months. He was introduced to a bottle when I had to go back to work at 5 months. He has never been fond of the bottle but would drink around 8-10 ounces from 8-3. He then started baby food. He loved baby food. Ate 3 times a day.

Fast forward to now. He will eat almost nothing. He will not take a bottle, and will not nurse unless he is going to sleep. The doctor is like blah blah he has enough wet diapers. He isn’t losing weight.

Thing is my child never poops. Maybe once a week with the help of a suppository.

The pediatrician did refer us to a program for speech therapy. To see if he has texture or swallowing issues. However I don’t think it’s that. Like I said he was fine with eating until just the past couple weeks.

Help! I’m so worried he is not getting enough. He is only in the 15 percentile.

Any other mommies experience this?